This perforated duct approach by itself in larger gas turbine system usually does not provide enough acoustic performance but can be used in conjunction with a gas path silencer. 3 Inch Top Stacks 3. With respect to internally lined turbine exhaust duct, the internal liner of the system can utilize a perforated duct liner instead of a solid, which would provide some acoustic performance. Classic XL Coronado FLD132 FLD120 FLD112 Classic Top Stacks Menu Toggle. Stack exit noise – is commonly handled with a parallel baffle silencer which is a series silencer panels with perforated facings across the gas path designed to meet need noise reduction (see absorptive silencer).These Grand Rock Stacks are triple plated chrome stack tips available separately or with a cat back or turbo. The materials are usually thicker, which may increase cost, but the acoustic ducting can help avoid the need to add additional treatments like a separate acoustical panel system. Build Your Own truck stacks, exhaust stack kit. SVI DYNAMICS will base material thickness selections for the inner liner, insulation and outer casing to get the needed transmission loss (TL) from the composition to meet the noise specifications. Ductwork radiated noise – can typically be a problem in the near-field environment related to meeting the standard 85 dBA off the equipment.The two sources of noise from ductwork and stacks are from noise radiated through the materials (casing/ductwork radiated) or out through the system discharge (stack exit) to atmosphere. While most of the time the lined ductwork design is based on meeting project goals for thermal performance, when acoustic performance is needed to meet noise criteria, SVI DYNAMICS can utilize the lined ductwork to meet project noise targets. The double wall duct or stack has an inner and outer steel wall that contains insulation between the two using a stud system to join the system together.
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